US7201122B2 - Device for controlling valve kinematics - Google Patents
Device for controlling valve kinematics Download PDFInfo
- Publication number
- US7201122B2 US7201122B2 US10/477,089 US47708904A US7201122B2 US 7201122 B2 US7201122 B2 US 7201122B2 US 47708904 A US47708904 A US 47708904A US 7201122 B2 US7201122 B2 US 7201122B2
- Authority
- US
- United States
- Prior art keywords
- valve
- cam
- opening
- closing
- rocker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/30—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of positively opened and closed valves, i.e. desmodromic valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/34403—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using helically teethed sleeve or gear moving axially between crankshaft and camshaft
- F01L1/34406—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using helically teethed sleeve or gear moving axially between crankshaft and camshaft the helically teethed sleeve being located in the camshaft driving pulley
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L13/0047—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction the movement of the valves resulting from the sum of the simultaneous actions of at least two cams, the cams being independently variable in phase in respect of each other
Definitions
- the present invention relates to a device for controlling the kinematics of at least one valve, the device comprising at least one opening cam and one closing cam, and at least one lever device cooperating with the valve and subject, together with the latter, to the action of an elastic member.
- variable control of valves i.e. variable timing
- variable timing is a complex problem that has often been approached.
- Certain electro-hydraulic systems offer a higher flexibility of the opening duration, but they suffer from the disadvantage of being very complex and are subject to technical problems that are difficult to solve, such as delays and the compressibility in the hydraulic circuits as well as the space consumption of their components.
- a control device as cited above which allows to control the opening and closing duration of the valve over a wide range (comprised, for the opening, between 210° and 350° of camshaft rotation approximately), while varying the opening and closing times of the valve(s) independently of each other.
- the implementation of this device may be provided for a wide range of engines.
- This object is attained by a control device wherein the elastic member constitutes a detent means acting upon the assembly composed of the lever device and of the stem of the valve in the opening direction of the valve, and in that the assembly comprising the rocker arm and the cam allows the opening of the valve and furthermore generates the return movement of said valve onto its seat for its closure.
- FIG. 1 schematically shows a first embodiment of a device of the invention with the valve in the closed position
- FIG. 2 shows the device of FIG. 1 with the valve in the open position
- FIG. 3 shows a second embodiment of a device of the invention with the valve in the closed position
- FIG. 4 shows the device of FIG. 3 with the valve in the open position
- FIG. 5 shows an angular offset control for the cams of FIGS. 1 to 4 .
- FIGS. 5 a and 5 b are front views of the opening and closing cams in FIG. 5 .
- FIG. 6 shows a third embodiment of a device of the invention with the valve in the closed position
- FIG. 7 shows the device of FIG. 6 with the valve in the open position
- FIG. 8 schematically shows the operation of the device and the superposed adjustment of the cams for a short opening
- FIG. 9 schematically shows the superposed adjustment of the cams of FIG. 8 for a long opening.
- FIGS. 1 and 2 refer to an engine with a cylinder head comprising two valves and two common camshafts for intake and exhaust.
- a rocker arm 1 with its two sliders 2 , 3 pivoting around its shaft 4 is controlled by two cams, namely an opening cam 5 and a closing cam 6 , the two cams rotating in opposite directions, as indicated by arrows 5 F, 6 F.
- Rocker arm 1 further comprises a fork 7 for controlling valve 8 , shown in the closed position in FIG. 1 and in the open position in FIG. 2 .
- Opening cam 5 includes three distinct geometric portions: a first concentric portion Y-A (corresponding to the retention of valve 8 against its seat 10 and to the takeover of rocker arm 1 during the closed valve phase (large radius R 2 of the cam)), a second eccentric portion A-B (causing the opening movement of the valve), and a third concentric portion B-L (small radius R 1 of the cam).
- closing cam 6 comprises a first concentric portion K-B′ (zone of takeover of rocker arm 1 during the open phase of valve 8 (small radius R 3 of the cam)), a second eccentric portion B′-C (causing the closing movement of the valve), and a third concentric portion C-X, corresponding to the retention of valve 8 against its seat 10 (large radius R 4 of the cam).
- Valve 8 is provided at its lower end with a tulip 9 adapted to press against a seat 10 , the tulip being followed by a stem 11 that is guided by a valve stem guide 12 and fastened by means of a locking device comprising a valve spring seat 13 cooperating with a circular clip 14 and sliding in a tubular valve retainer 15 whose upper part is fitted with a locking ring 16 allowing the closure of a non-referenced valve retainer chamber.
- Locking ring 16 is provided with a threaded bore for receiving an adjusting pin 16 G for adjusting the initial tension of a spring 17 adapted to act upon stem 11 of the valve (through elements 13 , 14 ).
- This damping spring 17 is accommodated in the space formed between the bottom of valve retainer 15 and valve spring seat 13 .
- the function of this damping spring is easily understood when comparing FIGS. 1 and 2 and reading the discussion of the operation of the device (see below, point 10 of the present disclosure).
- valve relieving spring 18 Inversely to valve controls of the prior art, an elastic member acting upon valve 8 and rocker arm 1 is formed of a valve relieving spring 18 . The latter tends to open the valve and allows the rocker arm, which retains the valve through valve retainer 15 , damping spring 17 and locking device 13 , 14 , to follow the profile of the cams.
- Spring 18 is maintained by an upper spring seat 19 , on one hand, and on the other hand, by a circular shoulder 20 formed around valve retainer 15 .
- FIGS. 3 and 4 show a variable timing system for an engine with a four-valve cylinder head with valve 8 in the closed and in the open position, respectively.
- One rocker arm 21 is common to two valves and pivots around a shaft 22 .
- the rocker arm comprises an arm 23 carrying a contact member 24 (e.g. a roller bearing or, as in the illustrated embodiment, a slider 24 ) and a fork 25 for actuating valve 8 .
- Opening cam 5 acts upon slider 24 of the arm of the rocker arm
- closing cam 6 acts upon a roller bearing 26 turning on an axle 27 mounted on the arm of the rocker arm provided with fork 25 .
- the rocker arm is not actuated by a spring that is positioned in the axis of the valve stem but by a detent spring 28 one shank of which rests on a stop 29 while the other shank rests on a stop 30 .
- the arrangement of the rocker arm is such that detent spring 28 tends to open the valve, as illustrated in FIG. 4 .
- This embodiment (common rocker arm for two valves) may also be conceived with the detent and damping systems described with reference to FIGS. 1–2 and 6 – 7 .
- the stem, retainer, guide, and seat of the valve are similar to those of the preceding embodiment, as well as the damping system with damping spring 31 , which is retained between a sleeve or threaded ring 16 B closing a non-referenced chamber of a support 32 and sliding on the valve extension rod 57 with threaded end, on one hand, and a support nut 33 that is blocked by a counternut 34 .
- Valve stem 11 and extension rod 57 are assembled by means of a coupling sleeve 35 that is retained between two counternuts 36 .
- FIG. 5 shows a device for offsetting the angular position of the camshafts relative to the crankshaft, the device being known per se. Opening cam 5 and closing cam 6 are shown in cross-section in FIG. 5 and in front view in FIGS. 5 a and 5 b , respectively, the cams being the same as those described above.
- Cam 5 is fastened on opening camshaft 37 and cam 6 on closing camshaft 38 , the camshafts being guided by respective bearings 39 , 40 .
- Sleeves 41 , 42 provided with helicoidal internal grooves 43 , 44 and comprising driving gears 45 , 46 of the camshafts are fastened by dowel pins 47 of the gears on the shaft.
- Camshaft 38 is provided with a toothed pinion 48 that is chain driven by the crankshaft, the pinion being connected to driving gears 46 by fastening means 49 .
- Control pieces 50 and 51 are fitted on a distance over the ends of the camshafts.
- the ends comprise an internal coupling by straight spline 52 , 53 and an external coupling by helicoidal grooves 43 , 44 .
- one or the other of the control pieces ( 50 , 51 ), or both, are slidingly displaced to obtain a shorter or longer valve opening duration.
- This control device is also applicable in other timing gear systems, e.g. with finger control or with direct actuation.
- FIGS. 6 and 7 show an embodiment for a cylinder head with two or four valves where cams 5 and 6 are arranged on a single camshaft (see also FIGS. 8 and 9 ).
- Valve 8 and its attachment as well as the elastic detent and damping members correspond to those of FIGS. 1 and 2 .
- Rocker arm 54 oscillating around its shaft 55 , is similar to the one illustrated in FIGS. 3 and 4 and comprises two sliders 56 of which only one is visible in the drawing, but it is understood that the control of the angular offset will have to be adapted correspondingly.
- FIGS. 8 and 9 schematically show the operation and the adjustment of the superimposed combination of the opening cam and the closing cam, the cams being adjusted to result in a short opening of the valve.
- the positions of the cams for a desired opening duration of the valve are illustrated, where A is the starting point of the opening, B′, B are the points between which the valve is maximally open, and C is the closure end point.
- the valve is closed on 240° and open on 120°.
- the arc X-Y represents minimum crossing of the cams when the latter are adjusted to the position of short opening of the valve.
- the opening cam is angularly offset by 30° in its rotating direction and the closing cam is angularly offset by 30° in the opposite direction of its rotation.
- the opening time of the valve is shifted to 180° (respective angles being expressed in degrees of cam rotation).
- the elastic detent means 18 , 28 acts upon the pair [lever device ( 1 ; 21 ; 54 ) ⁇ valve stem ( 11 )] in the opening direction of the valve ( 8 ), whereas the pair [rocker arm device ⁇ opening cam 5 /closing cam 6 ] fulfills a double function, namely to allow the opening of the valve and to move it back to its seat 10 for its closure.
- the operating mode may be demonstrated as follows (see particularly FIGS. 1–2 and 8 – 9 ):
- the drives of the opening and of the closing camshafts are provided with an angular offsetting device with helicoidal grooves, on one hand, and that the profiles of the cams are in agreement, on the other hand, allows to vary the opening and the closing time of the valve independently of each other. Furthermore, the damping device ensures tightness between the seat and the valve without shocks in the timing gear and compensates for the lengthening of the valve due to thermal dilatation.
- the cams can be mounted on their shafts in different ways and may be rotationally driven in the same direction. It is also possible to provide a respective shaft for each cam or a common shaft or common shafts.
- the device operates as a “variable cam”, figuratively speaking.
Abstract
Description
-
- 1. The end of the phase in which
valve 8 is closed is ensured by the cam surface corresponding to the profile A-Y ofopening cam 5. - 2. The opening phase starts when
slider 2 has passed point A ofcam 5. - 3.
Valve detent spring 18 expands and enablesslider 2 to follow the eccentric profile A-B. - 4. From the moment when
slider 2 passes point A, and over about 8° of rotation ofcam 5, the valve remains closed and dampingdevice 17 expands to its initial position (seepoint 10 below andFIG. 1 ). - 5. From the instant when this initial position is attained, the movement of
cam 5 onrocker arm 1 causes the valve to be lifted from itsseat 10. - 6. When
slider 2 arrives at point B ofcam 5,slider 3 simultaneously contacts concentric surface K-B′ ofclosing cam 6 which actuatesrocker arm 1 during the closing phase. The valve is now maximally open (seeFIG. 2 ). - 7. The closing movement of the valve and the compression of
detent spring 18 start whenslider 3 arrives at point B′ ofcam 6 and continue until the slider arrives at point C. - 8. For a short opening of the valve, e.g. during 210° of crankshaft rotation,
slider 3 contacts surface K-B′ exactly at point B′, and as points B and B′ coincide, the valve immediately starts to close again. - 9. For a longer opening up to 350° of crankshaft rotation, three solutions are possible:
- A) either an angular offset of the closing camshaft contrary to the rotational direction, thereby retarding B′-C and thus the closing movement by increasing the distance between B′ and B by means of the angular offsetting device.
- B) or an angular offset of the opening camshaft in the rotational direction, thereby advancing A-B and thus the opening movement by increasing the distance between B and B′ by means of the angular offsetting device of the opening camshaft.
- C) or the simultaneous application of the two possibilities.
- In all three cases, the valve remains maximally open during the time in which
slider 3 moves from B to B′.
- 10. The valve contacts its
seat 10 about 8° beforeslider 3 reaches pointC. Damping device 17 is compressed—retainer 15 slidingvalve spring seat 13 on stem 11- and compensates the rest of the lifting movement imparted bycam 6 during the entire duration of the valve closure. - 11. The valve closure phase is divided into two stages. In a first stage, the valve is kept closed and
detent spring 18 compressed by the action of surface C-X ofcam 6 onslider 3. - 12. During this action,
slider 3 is in waiting position for the flush passage of point Y ofcam 5, which marks the second stage. - 13. From then on,
rocker arm 1 is taken over by surface A-Y of cam at least 5° of cam rotation beforeslider 3 arrives at X (in order to ensure a minimum cam crossing XY in the case of a short valve opening). - 14. Thus, the transition from one cam to the other is free of shocks, and the cycle may start again.
- 1. The end of the phase in which
Claims (13)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH2001847/01 | 2001-05-10 | ||
CH8472001 | 2001-05-10 | ||
PCT/CH2002/000244 WO2002090728A1 (en) | 2001-05-10 | 2002-05-07 | Device for controlling valve kinematics |
Publications (2)
Publication Number | Publication Date |
---|---|
US20040163615A1 US20040163615A1 (en) | 2004-08-26 |
US7201122B2 true US7201122B2 (en) | 2007-04-10 |
Family
ID=4541955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/477,089 Expired - Fee Related US7201122B2 (en) | 2001-05-10 | 2002-05-07 | Device for controlling valve kinematics |
Country Status (7)
Country | Link |
---|---|
US (1) | US7201122B2 (en) |
EP (1) | EP1386061B1 (en) |
JP (1) | JP2004531670A (en) |
AT (1) | ATE389786T1 (en) |
DE (1) | DE60225683T2 (en) |
ES (1) | ES2301630T3 (en) |
WO (1) | WO2002090728A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090013967A1 (en) * | 2007-07-09 | 2009-01-15 | George Louie | Spring-less valve train for internal combustion engine |
US20090320778A1 (en) * | 2008-06-28 | 2009-12-31 | Schaeffler Kg | Coupling device of a switchable cam follower of a valve train of an internal combustion engine |
US20120291733A1 (en) * | 2009-02-17 | 2012-11-22 | Barnes David M | Variable valve actuation apparatus, system, and method |
US10072537B2 (en) | 2015-07-23 | 2018-09-11 | Husco Automotive Holdings Llc | Mechanical cam phasing system and methods |
US10450945B2 (en) | 2016-01-12 | 2019-10-22 | GETAS GESELLSCHAFT FüR THERMODYNAMISCHE ANTRIEBSSYSTEME MBH | Method for operating an axial piston motor, and axial piston motor |
US10557383B2 (en) | 2017-01-20 | 2020-02-11 | Husco Automotive Holdings Llc | Cam phasing systems and methods |
US10900387B2 (en) | 2018-12-07 | 2021-01-26 | Husco Automotive Holdings Llc | Mechanical cam phasing systems and methods |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006018998A1 (en) * | 2006-04-25 | 2007-10-31 | Schaeffler Kg | Coupling device between a gas exchange valve and a valve actuating element |
US20080078345A1 (en) * | 2006-09-28 | 2008-04-03 | Knauf Michael B | Phaser-actuated continuously variable valve actuation system with lost motion capability |
DE102007013946A1 (en) * | 2007-03-23 | 2008-09-25 | Schaeffler Kg | Valve gear of an internal combustion engine |
WO2011089450A2 (en) | 2010-01-25 | 2011-07-28 | Andrew Peter Nelson Jerram | Apparatuses, methods and systems for a digital conversation management platform |
GB201307317D0 (en) | 2013-04-23 | 2013-05-29 | Camcon Auto Ltd | Valve System and Methods of Operation Thereof |
CN114033521B (en) * | 2021-12-13 | 2023-12-22 | 南通职业大学 | Double-cam variable valve timing mechanism |
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US1633882A (en) * | 1924-11-17 | 1927-06-28 | Ballot Ernest Maurice | Valve-operating mechanism |
GB359715A (en) | 1930-10-25 | 1931-10-29 | Philip Francis Oddie | Improvements in valves for internal combustion engines |
US2641236A (en) * | 1944-10-11 | 1953-06-09 | Whitworth & Co | Means for actuating valves and other reciprocating parts |
US3313280A (en) | 1965-04-16 | 1967-04-11 | Automobile Racing Club Of Okla | Variable valve timing mechanism |
US4420141A (en) * | 1981-08-26 | 1983-12-13 | Caterpillar Tractor Co. | Variable rate valve spring |
US4724822A (en) * | 1986-02-28 | 1988-02-16 | General Motors Corporation | Variable valve lift/timing mechanism |
JPH01134009A (en) | 1987-11-19 | 1989-05-26 | Yoshiari Takagi | Dohc engine |
WO1996037688A1 (en) * | 1995-05-23 | 1996-11-28 | Csaba Gyimesi | Variable valve control for internal combustion engines |
DE10061711A1 (en) | 2000-03-09 | 2001-08-16 | Levon Grigorjan | Variable disconnectable valve control with continual full open position of valve for IC engine esp. multi-cylinder fast running vehicle engines with multi-valve |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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FR580440A (en) * | 1923-06-14 | 1924-11-06 | Desmodromic valve control |
-
2002
- 2002-05-07 ES ES02717930T patent/ES2301630T3/en not_active Expired - Lifetime
- 2002-05-07 DE DE60225683T patent/DE60225683T2/en not_active Expired - Lifetime
- 2002-05-07 AT AT02717930T patent/ATE389786T1/en not_active IP Right Cessation
- 2002-05-07 EP EP02717930A patent/EP1386061B1/en not_active Expired - Lifetime
- 2002-05-07 WO PCT/CH2002/000244 patent/WO2002090728A1/en active IP Right Grant
- 2002-05-07 JP JP2002587770A patent/JP2004531670A/en active Pending
- 2002-05-07 US US10/477,089 patent/US7201122B2/en not_active Expired - Fee Related
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US1633882A (en) * | 1924-11-17 | 1927-06-28 | Ballot Ernest Maurice | Valve-operating mechanism |
GB359715A (en) | 1930-10-25 | 1931-10-29 | Philip Francis Oddie | Improvements in valves for internal combustion engines |
US2641236A (en) * | 1944-10-11 | 1953-06-09 | Whitworth & Co | Means for actuating valves and other reciprocating parts |
US3313280A (en) | 1965-04-16 | 1967-04-11 | Automobile Racing Club Of Okla | Variable valve timing mechanism |
US4420141A (en) * | 1981-08-26 | 1983-12-13 | Caterpillar Tractor Co. | Variable rate valve spring |
US4724822A (en) * | 1986-02-28 | 1988-02-16 | General Motors Corporation | Variable valve lift/timing mechanism |
JPH01134009A (en) | 1987-11-19 | 1989-05-26 | Yoshiari Takagi | Dohc engine |
WO1996037688A1 (en) * | 1995-05-23 | 1996-11-28 | Csaba Gyimesi | Variable valve control for internal combustion engines |
DE10061711A1 (en) | 2000-03-09 | 2001-08-16 | Levon Grigorjan | Variable disconnectable valve control with continual full open position of valve for IC engine esp. multi-cylinder fast running vehicle engines with multi-valve |
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Title |
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Aug. 23, 1989 & JP 01 134009 A (Yoshiari Takagi). |
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009035482A2 (en) * | 2007-07-09 | 2009-03-19 | George Louie | Spring-less valve train for internal combustion engine |
WO2009035482A3 (en) * | 2007-07-09 | 2009-04-30 | George Louie | Spring-less valve train for internal combustion engine |
US20090013967A1 (en) * | 2007-07-09 | 2009-01-15 | George Louie | Spring-less valve train for internal combustion engine |
CN101619664B (en) * | 2008-06-28 | 2013-06-19 | 谢夫勒科技两合公司 | Coupling device of switchable cam follower of valve train of internal combustion engine |
US20090320778A1 (en) * | 2008-06-28 | 2009-12-31 | Schaeffler Kg | Coupling device of a switchable cam follower of a valve train of an internal combustion engine |
CN101619664A (en) * | 2008-06-28 | 2010-01-06 | 谢夫勒两合公司 | Coupling device of a switchable cam follower of a valve train of an internal combustion engine |
US8146552B2 (en) * | 2008-06-28 | 2012-04-03 | Schaeffler Technologies Gmbh & Co. Kg | Coupling device of a switchable cam follower of a valve train of an internal combustion engine |
US20120291733A1 (en) * | 2009-02-17 | 2012-11-22 | Barnes David M | Variable valve actuation apparatus, system, and method |
US10072537B2 (en) | 2015-07-23 | 2018-09-11 | Husco Automotive Holdings Llc | Mechanical cam phasing system and methods |
US10344631B2 (en) | 2015-07-23 | 2019-07-09 | Husco Automotive Holdings Llc | Mechanical cam phasing systems and methods |
US10711657B2 (en) | 2015-07-23 | 2020-07-14 | Husco Automotive Holdings Llc | Mechanical cam phasing systems and methods |
US10450945B2 (en) | 2016-01-12 | 2019-10-22 | GETAS GESELLSCHAFT FüR THERMODYNAMISCHE ANTRIEBSSYSTEME MBH | Method for operating an axial piston motor, and axial piston motor |
US10557383B2 (en) | 2017-01-20 | 2020-02-11 | Husco Automotive Holdings Llc | Cam phasing systems and methods |
US10900387B2 (en) | 2018-12-07 | 2021-01-26 | Husco Automotive Holdings Llc | Mechanical cam phasing systems and methods |
US11352916B2 (en) | 2018-12-07 | 2022-06-07 | Husco Automotive Holdings Llc | Mechanical cam phasing systems and methods |
Also Published As
Publication number | Publication date |
---|---|
EP1386061A1 (en) | 2004-02-04 |
JP2004531670A (en) | 2004-10-14 |
DE60225683D1 (en) | 2008-04-30 |
ATE389786T1 (en) | 2008-04-15 |
DE60225683T2 (en) | 2009-04-02 |
US20040163615A1 (en) | 2004-08-26 |
EP1386061B1 (en) | 2008-03-19 |
WO2002090728A1 (en) | 2002-11-14 |
ES2301630T3 (en) | 2008-07-01 |
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